1070-4272/04/7703-0501C2004 MAIK [Nauka/Interperiodica]
Russian Journal of Applied Chemistry, Vol. 77, No. 3, 2004, pp. 501!504. Translated from Zhurnal Prikladnoi Khimii, Vol. 77, No. 3,
2004, pp. 507!510.
Original Russian Text Copyright + 2004 by Yadykina.
AND POLYMERIC MATERIALS
Properties of Asphalt!Lime-Containing Mineral Powder System
V. V. Yadykina
Shukhov State Technological University, Belgorod, Russia
Received May 6, 2003
Abstract-Strength and water, frost, and heat resistance of asphalt binding compound were studied in relation
to the content of calcium oxide.
Asphalt3mineral composite is the main structural
component of asphalt concrete; it acts as binder and
strongly affects such properties of concrete as density,
strength, deformability, resistance to water, frost, and
heat, etc. .
The quality of asphalt binder (asphalt3mineral
powder binary system) is characterized by structural-
mechanical properties and their changes under the
action of external factors, especially, temperature and
The stability of these properties depends on the
organic binder and mineral powder and their ratio.
Since asphalt binder is an ultimately concentrated
disperse system, the interaction of the mineral surface
with asphalt provides the decisive effect. Hence, the
nature of the boundary and, especially, adhesion inter-
action between the filler and binder determine the
properties of composites and their operation stability
It is known that the adhesion of asphalt to mineral
materials is determined by their chemical composi-
tion. Numerous studies and factory experience show
that the best components are finely ground limestone
and dolomite [1, 2] chemically interacting with
asphalt. These powders are recommended for produc-
tion of asphalt concrete by GOST (State Standard)
In some cases, industrial wastes can also be used as
fillers in production of asphalt concretes, but, accord-
ing to GOST 9128397, the content of active CaO +
MgO must not exceed 3 wt %.
This limit has virtually no substantiation. More-
over, to activate acidic mineral fillers (rubble and
sand) and improve their adhesion to asphalt, lime is
added in asphalt concrete mixture in amounts of 132%
of the total system weight (i.e., 15320% of the weight
of mineral powder) [1, 4].
The data on utilization of finely dispersed industrial
wastes containing 15325% CaO as mineral filler of
asphalt concretes indicate that they improve the con-
crete properties .
The aim of this work was to determine the optimal
content of calcium oxide in the mineral powder and to
study its effect of structuring and properties of the
asphalt3lime-containing mineral powder system.
We used limestone from the Elets field and lime
purchased from the Stroimaterialy Joint-Stock Com-
pany (Belgorod, Russia). These mineral components
were thoroughly mixed in certain ratios; the properties
of the resulting powders are listed in Table 1.
The size distribution and specific surface area of
the mineral powders tested were similar (100% sifting
through sieve 0.071, 4500 cm
The asphalt binder was prepared by mixing of the
preheated components at 1503160oC for 536 min to
obtain a uniform mixture.
The optimal charge of asphalt for each composi-
tion was determined by the procedure given in .
We used BND-60/90 asphalt with the following
properties: penetration 21 010
and 83 010
at 0 and 25oC, respectively; softening point 41oC;
extensibility 3.8 and 70 cm at 0 and 25oC, respec-
tively; brittle point 17oC; and flash point 246oC.
The properties of the asphalt3lime-containing
mineral powder binary system were studied using
cylindrical samples (25 mm in diameter) according to
The interaction with asphalt and structuring proc-
esses as influenced by the properties of mineral